[workbox-build] Deprecated subdependencies: source-map@0.8.0-beta.0 and sourcemap-codec@1.4.8

## Environment
- **workbox-build version**: 7.4.0
- **Node.js version**: v24.x
- **Package manager**: pnpm v10.22.0

## Problem
When running `pnpm install` or `pnpm update`, the following deprecation warnings are shown:
`WARN 2 deprecated subdependencies found: source-map@0.8.0-beta.0, sourcemap-codec@1.4.8`

### Dependency tree

```
vite-plugin-pwa 1.2.0
└── workbox-build 7.4.0
├── source-map 0.8.0-beta.0 ← deprecated
└── @rollup/plugin-replace 2.4.2
└── magic-string 0.25.9
└── sourcemap-codec 1.4.8 ← deprecated
```

## Expected behavior
`workbox-build` should update its dependencies to use non-deprecated packages:
- `source-map@0.8.0-beta.0` → Replace with stable `source-map` or alternative
- `sourcemap-codec` → Replace with `@jridgewell/sourcemap-codec` (the recommended successor)

## Related issues
- #3019
- #3228

## Additional context
These warnings appear in every project using `vite-plugin-pwa` or any Workbox-based PWA tooling. While they don't affect functionality, they can cause confusion for developers maintaining production applications.